T. Liao. Webcanal: a multicast web application. In 6th International WWW Conference, Santa Clara, CA, April 1997.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....information such as stock market data should be delivered directly to consumers using CMP. Several push systems directly or indirectly rely on multicasting facilities, since it alleviates the requirements the push system has to fulfill in the broadcasting process. One such push system is WebCanal [95, 96], which is described in Section 3.3.5. 3.1.3 Real Time Transport Protocol The Real time Transport Protocol (RTP) 150] provides end to end transport services for transferring real time data over multicast or unicast networks. If the underlying network supports multicast, RTP can exploit this ....

....(repair packets) The flow control feature of LRMP allows it to keep an acceptable speed for the majority of receivers and tries to satisfy slower receivers when possible. The transmission rate is dynamically adapted to suit the available network bandwidth. LRMP is deployed in the WebCanal [95, 96] system that is described in Section 3.3.5. 3.1.4.5 Multicast File Transfer Protocol StarBurst s Multicast File Transfer Protocol [113] MFTP) is intended to provide an efficient and reliable transfer facility for data organized as files from a sender to multiple receivers. It has been optimized ....

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T. Liao. WebCanal: a multicast web application. Sixth International World Wide Web Conference (Santa Clara, California, USA, April 6--11,

....predictions when admitting or removing objects [KSW98a] In the Web, execution involves transferring the object to the client. Servers that execute predictions push objects to the clients [Bes96, BC96] The burden of distributing files to multiple clients may be reduced with multicast [NB97, Lia97, TH98] Clients execute predictions by prefetching objects [PM96, LD97] or by retaining objects in the cache. Client side execution allows the client to effectively manage its resources. A combination of push and pull [DKP01] can accommodate reduce the burden on the server while maximizing the ....

Liao, T., "WebCanal: a Multicast Web Application", in Proceedings of the Sixth International WWW Conference, Santa Clara, California, April 1997. 147

....tree degree is four; otherwise, key star (a special key tree with root degree equal to group size) outperforms small degree key trees. Keywords: Secure group communications, group key management, rekeying. 1. INTRODUCTION Many emerging web applications are based on a group communications model [12, 4, 15]. In the Internet, multicast has been used successfully to provide an efficient, best effort delivery service from a sender to a large group of receivers [6] Thus, securing group communications (i.e. providing confidentiality, authenticity, and integrity of messages delivered between group ....

T. Liao. Webcanal: a multicast web application. In 6th International WWW Conference, Santa Clara, CA, April 1997, 1997.

....sychronized such that the browsers display the same pages simultaneously. There are a number of slightly di ering models, each requiring the synchonized distribution of web documents and their embedded objects to multiple sites. A common name for this type of collaborative session is webcasting [1, 4, 16, 12]. A simple webcast design might require each remote node, or session participant, to individually fetch the required document from the origin server, the web server on which the document resides. In this scenario, one participant might send a Uniform Resource Locator (URL) the unique name used ....

....A second multicast approach is to build a client side web proxy to intercept participant s browser requests, fetch the data from the origin server, and then multicast the data to session participants. This approach capitalizes on multicast s scalability without requiring server modi cation. [12] and [16] both use this approach. They further improve scalability by caching data locally so that any browser requests that can be satis ed using previously cached data need not be forwarded to the server. This approach capitalizes on multicast s scalability without requiring server modi cation ....

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T. Liao. Webcanal: a Multicast Web Application. In 6th International WWW Conference, Santa Clara, CA, April 1997.

....chosen to use JSDT (Java Shared Data Toolkit) 25] JSDT is a framework based on the ITU T. 122 recommendation, Multipoint Communication Service [4] 26] implemented in Java with the option to use reliable multicasting communication protocols (ex: LRMP Light Weight Reliable Multicast Protocol [27 29]) The conference system relies on a hierarchy of nodes, clients customers and servers, organised in a tree topology, supported by JSDT links. The servers are the suppliers of the conference services, with a top server and some proxy servers. The collaborative applications are in the customer ....

....Light weight Reliable Multicast Protocol (LRMP) LRMP was designed as general purpose reliable transport protocol based on unreliable underling network transport protocols such as UDP IP. It offers three important features: loss repair, ordered packet delivery and adapted rate based flow control [27]. LRMP is implemented in Java as a reusable library. It is designed to work in heterogeneous network environments with multiple data senders. A totally distributed control scheme is adopted for local recovery so that no prior configuration and no router support are required [28] LRMP works in ....

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T. Liao (1997): "WebCanal: a Multicast Web Application", Proceedings of Sixth International World Wide Web Conference, 1997, ftp://ftp.inria.fr/INRIA/Actions/webcal

....similar to the use of DDE in WEBCLASS. Multicasting is accomplished with the a reliable multicast protocol that provides ordered multicast delivery using a token ring control mechanism. However, this method requires an explicit list of receivers, and token latency may limit scalability. WebCanal [8] is a proxy based synchronous browser program written in Java. Changes in the current URL displayed by the master browser are detected by a proxy, which parses files to identify inline images, and transmits the data to the set of receivers. Since WebCanal operates only as a proxy, local control ....

....the master browser are detected by a proxy, which parses files to identify inline images, and transmits the data to the set of receivers. Since WebCanal operates only as a proxy, local control operations (such as Back and Forward browser commands, and loading of local files) present difficulties [8]. In the WEBCLASS project, we opted for increased functionality over generality. By combining the use of a proxy with the DDE interface, WEBCLASS does not require HTML parsing and still provides support for multiframe documents, special files, and local control operations. The mWeb [11] is an ....

T. Liao. WebCanal: A multicast Web application. Computer Network and ISDN Systems, 29:1091--1102, 1997.

....information [6] which turns them inadequate for publish subscribe environments. This paper presents and discusses a set of proposed extensions to the CORBA Event Service, spanning issues related to the event channel, the suppliers, the consumers, the service architecture, and the use of LRMP [7]. The proposals addressed in this paper were developed and validated in a prototype environment named CONCHA CONference system based on java and corba event service CHAnnels) 8] which is a conference system based on ITU T.120 recommendations [9] with reliable multicast communication for ....

....must connect to the ProxyMulticastPushConsumer, by calling its method connect Multicastpush supplier, that will retrieve the InetAddress of the IP Multicast Group. It should create its own objects for reliable multicasting communication (using LRMP Light weight Reliable Multicasting Protocol [7]) which communicate the events directly to the multicast group. This process is similar to the standard process. Fig. 2. Connecting a Multicast Supplier to an Event Channel C. Consumers Multicast Consumer is defined as a new interface: MulticastPushConsumer in the CosEventComm module. If ....

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T. Liao (1997): "WebCanal: a Multicast Web Application", Proceedings of Sixth International World Wide Web Conference, 1997, ftp://ftp.inria.fr/INRIA/Actions/webcal

....with layered encoding or multi stream schemes[10, 11, 12, 13] Recent work has also looked at integrating the services of the MBone and the Real Time Protocol (RTP) into the the WWW. Several researchers are looking at various ways of using the MBone and multicast protocols to deliver WWW pages[14, 15, 16, 17]. Other issues are based on the integration of WWW and MBone style conferencing[18, 19] This paper is organized as follows. Section 2 describes our proposed jukebox paradigm and related paradigms. Section 3 details our implementation of a jukebox prototype called the Interactive Multimedia ....

T. Liao, "WebCanal: a multicast web application," in Sixth International World Wide Web Conference, (Santa Clara, California, USA), April 1997.

....interactive conferencing and program broadcasts[6, 7, 8, 9] Finally, recent work has looked at integrating the services of the MBone and the Real Time Protocol (RTP) into the the WWW. Several researchers are looking at various ways of using the MBone and multicast protocols to deliver WWW pages[10, 11, 12, 13]. Other issues are based on the integration of WWW and MBone style conferencing[14, 15] This paper is organized as follows. Section 2 describes our proposed jukebox paradigm and other related paradigms. Section 3 details our implementation of a jukebox prototype called the Interactive Multimedia ....

T. Liao, "WebCanal: a multicast web application," in Sixth International World Wide Web Conference, (Santa Clara, California, USA), April 1997.

....the number of caches subscribed at every cache tier will be small, and thus, caches will use unicast to distribute every document update among cache tiers. VI. RELATED WORK Currently, there are several technologies in the Internet that implement a true push distribution using multicast. WebCanal [24] is used to distribute presentations, software updates, etc. TIBCO [25] is used to distribute stock market quotes and finance information. The Muse protocol[26] uses the MBONE [27] to distribute articles on the USENET. Recently, there have been other proposals to push popular and frequently ....

Tie Liao, "Webcanal: a multicast web application," in Sixth International World Wide Web Conference, April 1997.

....like conferencing and conference broadcasts[6, 7, 8] Finally, recent work has looked at integrating the services of the MBone and the Real Time Protocol (RTP) into the the WWW. Several researchers are looking at various ways of using the MBone and multicast protocols to deliver WWW pages[9, 10, 11, 12]. Other issues are based on the integration of WWW and MBone style conferencing[13, 14] This paper is organized as follows. Section 2 describes our proposed jukebox paradigm and other related paradigms. Section 3 details our implementation of a jukebox prototype called the Interactive Multimedia ....

T. Liao, "WebCanal: a multicast web application," in Sixth International World Wide Web Conference, (California, USA), April 1997.

....from such service upgrades can adversely aoeect long running sessions of highly available distributed services. To enable service extensibility, we leverage the trend towards using interpreted languages (such as Java [11] Safe TCL [3] or Python [16] for distributed services and applications [13]. Interpreters for such languages already support or can be extended to support dynamic procedure instantiation: that is, code for a procedure can be installed in the run time environment after a program has started executing, but when, or before, the procedure is referenced. We can use this ....

Tie Liao. WebCanal: A Multicast Web Application. In Proceedings of the Sixth International World Wide Web Conference, Santa Clara, CA, April 1997.

....radio distribution. However, the push mechanism implemented on the most popular Internet browsers, Netscape browser v4.02 [5] and Microsoft Internet explorer v4 [4] uses a unicast pull push paradigm between the client and the source but does not exploit the benefits of a multicast distribution [30]. Published in IEEE Network Magazine, March April, 1998, vol 12 2, pp 18 31 Multicast distribution of Web documents is an area that merits further research, given the Web s dominance of Internet traffic and the known efficiency of multicast delivery. In the case of very popular documents that ....

T. Liao, "WebCanal: a Multicast Web Application", In Sixth International World Wide Web Conference, april 1997.

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T. Liao. Webcanal: a multicast web application. In 6th International WWW Conference, Santa Clara, CA, April 1997.

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Tie Liao. Webcanal: a Multicast Web Application. In 6th International WWW Conference, Santa Clara, CA, April 1997. 23

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